Steam superheater



c. A. PARSONS AND 3;. s. COOK. STEAM SUPERHEATER.

v APPLICATION FILED APR. 7, 1917.

I I I I 1,,&38,397

lumen/Zone.- C'harles A.1arson,,s, Stanley A51 6 004 6,

Atlas Patented Dec. 12,1922.

seven are.

CHARLES ALGEBNOBT IPABLSOI S AND STANLEY SMITH COOK, OF WALLSEND-ON-TYNE, ENGLAND; SAID COOK ASSIGNOR TO SAID PARSONS.

STEAM SUPERHEATER.

Serial No. 165,048.

(GRANTED UNDER THE PROVISIONS F 'lI-IE AGT 0F MARGH 3, 1921, 41 STAT. L., 1313.)

whom may concern: known that we, CHARLES r Lsnnnon' and ST...-NLEY SMITH Coon, both subjet s of the King of Great Britain and 5 Ireland. residing at Turbinia Vforlrs, il allsend-on 'llyne. Northumoerland, inland,

have invented certain new and u. rul linn pro v ments in and Relating to Steam Super,-

heatcis (for which we have filed application in England May 13, 1916, Patent No. 108,690), of? which the following is speci fication.

The present invention consists in prevent- Slfi: heating of a superheater when the ordinary consumption 01": steam is reduced or ceases, by the provision of an additional relief valve at the steam exit of the superheater arranged to blow off at a lower pixssure than the relief valve on the boiler so that at all times when the steam consumption is reduced a flow of steam. is caused through the superheater which is thus prevented from attaining an excessive temperature.

in the drawings:

F: l is a view of an ordinary Scotch boiler provided with a superheater.

2 is a detail view of the safety valve of the superheater.

In carrying the invention into effect ated, the boiler a is of the ordinary The steam the boiler a and passes through the Z to the superheater whence it passes 'h the safety valve 6 to the stop valve ty valve e is provided in addition to iuar boiler safety valve g and the ct valve (2 is set to blow off at a lower pressure than the safety valve (7. By

40 taining the ordinary boiler safety valve 9 valves Z or n can be fitted by means of which the superheater can be shut off and the steam passed dir ct from the boilers to the main engines if desired. Any known baffling devices may be provided adapted to be brought into position to protect the superheater tubes when these are not in action.

Fig. 2 shows the superheater safety valve. The spring 0 is set to correspond to a blow off pressure lower than the pressure to which the boiler safety valve is set. The pipe .9 connected to a high pressure steam space in the main. engines so that the steam pressure in the chamber 1' acting on the annular area w increases the total downward force on the valve. llhis additional force on the valve will enable the maximum pressure to be carried at high powers, while at low pow rs the valve will blow off at lower pressures. Additional security is thereby given to the superheater, as, under any running conditions, any reduction in the power increases the liability of the superheater safety valve to blow oft.

Having now fully described and ascertained our said invention and the manner in which it is to be performed, we declare that what we claim is In combination, in a, steam boiler system, a superheater for superheating the steam on its we; to the engines and a relief? valve at said superheater discharging to atmosphere and opening; automatically to induce circulation of saturated steam through the superheater when the pressure therein rises to a prescribed limit, said valve being subjected to closing pressure from steam in the high pressure steam space of the engines to place resistance on the valve variable according; to the pressure of the steam at high and low powers ot the engine, substantially as described.

In testimony whereof, we have affixed our signatures.

CHAR-LES ALGEBNON PARSONS.

STANLEY SMITH COOK. 

